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  <title>Escape a string to be used as a shell argument</title>

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</div><hr /><div id="function.escapeshellarg" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">escapeshellarg</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.3, PHP 5)</p><p class="refpurpose"><span class="refname">escapeshellarg</span> &mdash; <span class="dc-title">Escape a string to be used as a shell argument</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.escapeshellarg-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>escapeshellarg</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$arg</code></span>
   )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>escapeshellarg()</strong></span> adds single quotes around a string
   and quotes/escapes any existing single quotes allowing you to pass a
   string directly to a shell function and having it be treated as a single
   safe argument.  This function should be used to escape individual
   arguments to shell functions coming from user input.  The shell functions
   include <span class="function"><a href="function.exec.html" class="function">exec()</a></span>, <span class="function"><a href="function.system.html" class="function">system()</a></span> and the
   <a href="language.operators.execution.html" class="link">backtick operator</a>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.escapeshellarg-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">arg</code></em></dt>

     <dd>

      <p class="para">
       The argument that will be escaped.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.escapeshellarg-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The escaped string.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.escapeshellarg-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3581">
    <p><strong>Example #1 <span class="function"><strong>escapeshellarg()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />system</span><span style="color: #007700">(</span><span style="color: #DD0000">'ls&nbsp;'</span><span style="color: #007700">.</span><span style="color: #0000BB">escapeshellarg</span><span style="color: #007700">(</span><span style="color: #0000BB">$dir</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.escapeshellarg-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.escapeshellcmd.html" class="function" rel="rdfs-seeAlso">escapeshellcmd()</a> - Escape shell metacharacters</span></li>
    <li class="member"><span class="function"><a href="function.exec.html" class="function" rel="rdfs-seeAlso">exec()</a> - Execute an external program</span></li>
    <li class="member"><span class="function"><a href="function.popen.html" class="function" rel="rdfs-seeAlso">popen()</a> - 打开进程文件指针</span></li>
    <li class="member"><span class="function"><a href="function.system.html" class="function" rel="rdfs-seeAlso">system()</a> - Execute an external program and display the output</span></li>
    <li class="member"><a href="language.operators.execution.html" class="link">backtick operator</a></li>
   </ul>
  </p>
 </div>

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